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本文研究了稀土元素对新型耐热铸钢热疲劳性能的影响,结果表明,随着钢中稀土含量的增加,热疲劳裂纹萌生的循环周次增加,裂纹扩展速度减慢,稀土含量超过0.1%,以上效果尤为显著。时效态热疲劳裂纹萌生较铸态为快,而裂纹扩展速度较铸态慢。本文依据 Manson-coffin 公式、分析了产生上述现象的原因.作者研制的新型铬镍钨钼稀土耐热铸钢活动篦板具有良好的热疲劳性能,已在水泥厂取得很好的效率.
In this paper, the effects of rare earth elements on the thermal fatigue properties of a new heat-resistant cast steel were investigated. The results show that with the increase of rare earth content in the steel, the cycle of thermal fatigue crack initiation increases and the crack propagation rate slows down. When the RE content exceeds 0.1% , The above effect is particularly significant. Time-dependent thermal fatigue crack initiation is faster than as-cast and crack propagation is slower than as-cast. Based on the Manson-coffin formula, the reasons for the above phenomenon are analyzed.The new chrome-nickel-tungsten-molybdenum rare earth heat-resistant cast steel grate plate has good thermal fatigue properties and has achieved good efficiency in the cement plant.